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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae181f621a0980890a3c0b8301c976f98646bbdaf23794f96060539d1972ceb' 
  AND token = 'Iq2/bxKYLpfP1HqAoeTAQiQC15RJJMY7LJUfOZ95/KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}